From 84026301694b98dd08272e613da3497b17023d5c Mon Sep 17 00:00:00 2001 From: Dmitry Fleytman Date: Sat, 9 Mar 2013 11:21:03 +0200 Subject: net: iovec checksum calculator Signed-off-by: Dmitry Fleytman Signed-off-by: Yan Vugenfirer Signed-off-by: Stefan Hajnoczi --- net/checksum.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'net/checksum.c') diff --git a/net/checksum.c b/net/checksum.c index 4fa5563e7..14c08550e 100644 --- a/net/checksum.c +++ b/net/checksum.c @@ -15,6 +15,7 @@ * along with this program; if not, see . */ +#include "qemu-common.h" #include "net/checksum.h" #define PROTO_TCP 6 @@ -84,3 +85,31 @@ void net_checksum_calculate(uint8_t *data, int length) data[14+hlen+csum_offset] = csum >> 8; data[14+hlen+csum_offset+1] = csum & 0xff; } + +uint32_t +net_checksum_add_iov(const struct iovec *iov, const unsigned int iov_cnt, + uint32_t iov_off, uint32_t size) +{ + size_t iovec_off, buf_off; + unsigned int i; + uint32_t res = 0; + uint32_t seq = 0; + + iovec_off = 0; + buf_off = 0; + for (i = 0; i < iov_cnt && size; i++) { + if (iov_off < (iovec_off + iov[i].iov_len)) { + size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size); + void *chunk_buf = iov[i].iov_base + (iov_off - iovec_off); + + res += net_checksum_add_cont(len, chunk_buf, seq); + seq += len; + + buf_off += len; + iov_off += len; + size -= len; + } + iovec_off += iov[i].iov_len; + } + return res; +} -- cgit v1.2.3